Stoker



Feb. 16, 1932. J KERR ET AL 1,845,285

STOKER Filed April 12, 1928 s Sheets-Sheet 1 ATTORN EY5 Feb. 16, 1932. H. J. KERR ET AL 1,845,285

STOKER Filed April 12, 1928 5 Sheets-Sheet 2 F3 Fig-.4.

' 4' 3 g i y 7/ 3 I 3 L I III H I II Fig- INVENT 5 ATTORNEYS H. J. KERR ET AL STOKER Feb. 16, 1932.

F-iled April 12, 1928 3 Sheets-Sheet 3 Fig-:12-

W/Y'M ATTORNEYS Patented Feb. 16, i932 HOWARD J. KERR, or WESTFIELD, nnw .imasEY, AND JAMES n' rnarnnn, or BARBER;

TON, OHIO, Assrenonsfro 'rHnBAncocx & wILcox'oo r'rAnY', or nayonnn'ynnw JERSEY, A coarone'rron or NEW JERSEY I d Application filed April .1 2, 1928." Serial No. 269,335.

This invention relates to-an improvement in a construction of stokers, and more particularly in stokers'of the 'chain-grate type.

In stokers of that type, trouble has been experienced by theheating and consequent expension of the grate. This heating will cause the lower run to sag, and it has. been customary to tighten up the stokerl to prevent this sagging- Then, whenthe stoker be:

comes cool, an additional tension is placed thereon which often'causesundue stra n:

. According to the invention, we providean adjusting means for taking up thesagfin the grate and, at the same time so constructthis adjusting means that it will yield when the stoker contracts, before undue strainisput upon the stoker.

In the accompanying drawings, in which we have'shown selected embodiments of our invention 1 f f Fig. 1 is a sectional view through a portion of a, furnace and grate havingour invention embodied therein, the showing' of this-figure being diagrammatic in character. I 1

shaft, this view being taken on the line 2-2 of Fig. 3. V 1

- Fig.3 is a section on the.1ine3'3 of Fig. 2. Fig. 4 is a section on the line 4 4 of Fig. 2. Fig. 5 is a section on the line 5-5" of Fig. 8. Fig.6 is a view similar toFig; 2, but showing a different embodiment of the invention, this View; being taken on the line 6-6 of Fig.7. f fl p Fig. 7 is a section on theline 7-7' of Fig. 6. Fig. 8 is a section on the'line 8 -8 of Fig. 6. Fig. 9'is-a section on'the line 9- 9 of Fig. 7. Fig. 10 is a view similar toFig.-2, but show ing a still further embodiment of 'the'invem tion, this view being taken on the line 10'10.

of Fig. 11.

Fig; 11 is a section taken on theline' 01": Fig. 10.

ofFig.11. 7 p Fig. 13 is another .view simlla'r to Fig. 2,

but showinga still; further embodiment 25 Fig.v 2 is a horizontal sectional view through one end of a bearing for a Stoker end of the guides '5', this member being a ces s 12'therein, within which: is disposed'a a d the thrust' im;

I p 7 V 1 R 'inmovin'g thefbearing 11 lengthwise of the Fig. 12 is asection taken on-the line is a section taken on the line I of Fig.:13.- Fig. 15 is a seamen a. the line 15 15 of Fig-14.

Referring to I Fig. 1 well ave shown there-i g5 ina portionof a furnace having ahopper 1 from which coal, is fedtoflle top run.2 of a chainsgrate stoken This stokeri s-of any usual form, and is merely-shown diagrammatically in this figure. ltrwill not be de 5 V scribed in detailbutfiorthe purposes of this application, it is ,suflicientto say that it:is

operated in the usual manner, bysprockets supported'onshafts at-opposite ends of the stoker. g "j l One ofthese shafts is herein diagrammatically indicateda133, together with its adj usting mechanism 4.: This listing-mechanism is more fullyshownin connection with the other figures of the drawings, and is used part of the same frame as the guides.--Se-.

. curedin-the fixedmember and held against rotation therein, as by setscrews, is a nut 7 in ,which, is threaded an adj ustingiscrew 8. In this form the screw. is provided-with a capstan: adjusting head 9. which is drilled to form a recess for the thrust pin lo.

The bearing 11 for the shaft 3 has a rehearing member 18 Ijwhich is connected to the thnustpin 1O by-means of a shear pin-14 extending through both the bearing member By' this means, When the grate expands, the sag thereininay be taken up by. turningthe capstan. headed screw which will result it will be understood'that similar adjusting means maybe provided for as many bearing's of theishafts 3 as may be found convenient.

' V For example, itthe shaft hastwo bearings l p' p to move thebearingofthe shaft alongguides at opposite ends thereof, two adjusting means will probably be used.

When the grate cools, however, a shrinkage takes place, and the adjusting means against rotation. The thrust in this formis takenbythe capstan nut 17 *which is threaded upon the screw 15, and this nut bears against a collar 18 received in arecess 19 in the fixedmember 6. V

The collar is secured in the fixed member by means of shear pins 20,, and it willbe noted that the recess 19 is of such a size that when the shear pins break, the collar may have movement towardthe left in the recess. Th front" face vof the fixed member 7 6: is also providedwith a recess 21 to receive the nut 17 upon breaking of the shear pin, and in this form the .recessis sufficiently deep so that the nut cannot again be'turned to adjust the screw until-the screw has been moved forwardly and the shear pins put in position, the'holes in thenutbeing sufficient '-ly covered by the wallsof the recess to pre vent insertion of a tool therein,-

' Referring now to Figs. 10, 11 and 12, the

adjusting screw 22 is provided with a cap it stan head 23 whichhas a recess 24- within which is. disposed'the thrust pin '25. 1 This thrust pin is "secured to the headby; means of theshear pin 26 which, aslinthe other forms,-is adapted to yield before any part ofthe'grate When yielding takes place, the

holes in'the head are covered by a guard 33, preventing turning of the head until anew shear pin has been installed. 7

In Figs. 13, 14 and15, the adjusting screw 27 has a squared end 28 disposed in a-irecess 29 in the capstan nut 30, which has a projection'31 in a recess in the bearing 11. The I squared end 28 is secured to the: nut 30 by means of theshear We cla1m: 1. Ina chain-grate stoker, a movable bearpin 32.

ing for a shaft of the stoker, means to adjust said bearing to take up slack as thegrate expands, and a relatively weak connection be tween said bearing and'adjust'ing means and adapted to fracture as the grate shrinks if proper adjustment of the bearing is not made to relieve the straln on the ad usting means.

2; In a chain-grate stoker, a movable bearr ing fora shaft of the stoker,'meansto adjust said bearing, arelativelyweak connection between sa1d bearmg'and adjusting meansand saidfscrew when said ishear pin is adapted to yield if proper adjustment of the bearing is not made to relieve the strain on the adjusting means, and means preventing operation of said adjusting means after yielding'of said connection;

' 3. In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movable with the shaft lengthwise of the stoker,

an adjusting screw to causemovement of said bearing to take up slack as the grate expands, and a shear pin between the bearing and the in the stoker as the grate shrinks.

' 4:111 a chain-grate stoker, a bearing for a shaft of saidstokensaid bearing being movable" with the shaft lengthwiseof the stoker, a fixed memberadjacent said bearing, an adjusting'scr ew supported by said member operable toc'ause movement of said bearing to take up slack as the grate expands, and a shear pin between said bearing and member forthe purpose setforth.

In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movable with the shaft lengthwise of the stoker, a

fixed" member adjacent said bearing, an "adjusting screwsupported by said member opera-ble to'cause movement of said bearing to take up slack as the grate expands, and a shea'r'fpin connecting certain of said members yield'ableu'pon undue strain being exerted on said stoker as the grate shrinks. v 7' 6.";In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movable with the shaft lengthwise ofthe stoker, an, adjusting screw to cause movement of said bearing to take up slack as the grate expands, a thrust pin carried by said screw and engag ing said bearing, and arelatively weak shear pin connecting'the screwand thrust pin 'yield- "able upon undue strain being exerted on sand stoker as thegrate shrinks. t 7. In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movable with the shaft lengthwise of the stoker,

an'adjusting screw to cause movement of said 'bear1ng, athrust'p1n carried by' said'screw and engaglng said bearlng, a relatively weak shear pin connecting the screw and thrust pin, and means preventing operation of said screw K when said shear pin is broken or displaced.

-8. In achain-grate' stoker, a bearing for a i shaft of said stoker, said bearing being movable with the sha-ft'lengthwise of the stoker, a; fixed member adjacent said bearing, an adjusting screw supported by said member, means to operate said screw, a relatively weak connection betweenthe fixed member and the bearing, and means preventing operation of broken or displaced.

v 9. In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movscrew, yieldable upon undue strain occurring able with the shaft lengthwise of the stoker,

a fixedmemberadjacent said bearing, an adjusting screw supported by said member, an adjusting head on said screw, athrust pin disposed in a recess in said head and in engage-v ment with'said bearing, and ashear pin connecting said head and said thrust .pin for the purpose set forth.

10. In a chain-grate stoker, a bearing for a shaft of said stoker, said bearing being movable with the shaft lengthwise of'the stoker, I a fixed member adjacent said bearing, an ad-v justing screw supported by said member, an

adjusting head on'said screw, a thrust pin disposed in a recess in said head and in engagement with said bearing, a shear pin connecting said head and said thrust pin, and a guard on sald bearing movable when said shear pin breaks, into position to prevent operation of said head by a tool. HOWARD J.

KERR I JAMES E. TRAINER. a 

